GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 1887937  Size: SH
  1. Disconnect the negative battery.
  2. Remove the instrument panel and tie-bar. Refer to Instrument Panel Assembly Replacement .
  3. Remove the heater/air distributor case assembly. Refer to HVAC Module Assembly Replacement .
  4. Seperate the heater core housing from the heater/air distributor case assembly. Refer to Heater Core Replacement .

  5. Object Number: 1887939  Size: SH
  6. Disconnect the pre heater wiring harness connector.
  7. Remove the pre heater mounting screws.
  8. Remove the pre heater.

Installation Procedure


    Object Number: 1887939  Size: SH
  1. Install the pre heater with the screws.
  2. Connect the pre heater wiring harness connector..

  3. Object Number: 1887937  Size: SH
  4. Install the heater core housing to the evaporator housing. Refer to Heater Core Replacement .
  5. Install the heater/air distributor case assembly. Refer to HVAC Module Assembly Replacement .
  6. Install the instrument panel and the tie-bar. Refer to Instrument Panel Assembly Replacement
  7. Connect the negative battery.